Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Other Income and Expenses [Abstract]
Interest income	$ 0.4
Net periodic postretirement benefit cost	(2.0)	$ (1.4)
Unrealized gain (loss) on equity securities	0.1	(0.4)
Gain on disposition of property, plant and equipment	15.0	(0.3)
All other, net	0.1	0.2
Other income (expense), net	$ 13.6	$ (1.6)